In SARS infections, serum levels of pro‐inflammatory cytokines, especially IL‐6, increase from normal (17 pg mL−1) to high levels (>41 pg mL−1), with these levels correlating to infection severity (Figure S1C,D, Supporting Information).[51, 61, 126, 127] Lymphocyte plasma count correlates negatively with nAb titers. This evidence concerns the gene IL6 and infection.